F region Tee
That portion of the ionosphere existing between approximately 160 and 400 km above the surface of the Earth, consisting of layers of increased free-electron density caused by the ionizing effect of solar radiation. Note 1: The F region reflects normal-incident frequencies at or below the critical frequency (approximately 10 MHz) and partially absorbs waves of higher frequency. Note 2: The F1 layer exists from about 160 to 250 km above the surface of the Earth and only during daylight hours. Though fairly regular in its characteristics, it is not observable everywhere or on all days. The principal reflecting layer during the summer for paths of 2,000 to 3,500 km is the F1 layer. The F1 layer has approximately 5 ´ 105 e/cm3 (free electrons per cubic centimeter) at noontime and minimum sunspot activity, and increases to roughly 2 ´ 106 e/cm3 during maximum sunspot activity. The density falls off to below 104 e/cm3 at night. Note 3: The F1 layer merges into the F2 layer at night. Note 4: The F2 layer exists from about 250 to 400 km above the surface of the Earth. The F2 layer is the principal reflecting layer for HF communications during both day and night. The horizon-limited distance for one-hop F2 propagation is usually around 4,000 km. The F2 layer has about 106 e/cm3. However, variations are usually large, irregular, and particularly pronounced during magnetic storms.
The Urban Dictionary Tee
Customer Reviews
Smooth transaction and nice product, shipping was quick!
good very good worth money!
5 out of 5 I love when people start reading the definition. It's halourious
10/10 yes much good 10/10 would buy again
Fit is true to size, good quality material. Graphics applied well (not off-center or angled as with some products). Quick shipment.
gooderesting the gooderesting thing ever made
Got it for a friend! He loved it
Size was accurate, and printed text was as displayed online. Doesn't hurt that the material is pretty soft either.
mine says "ass" on it lol
Good Decent, comfortable by all means
My wife bought this for me, my only thing about the shirt, is the big Vernon on the front. I think I would prefer it situated and smaller type as if overva pocket. Other than that I love it. Seems to be of good quality and easy wearability, but I have only tried it on, so am uncertain. Thank you for making my day
shirt made me cum
Dick Aww man I love this shirt for eating
people shat on my shirt that said shart and im mad they took a shit on it instead of a shart
Necero's shirt i can use this in almost every phrase. This shirt allows me to do some great stuff with my kids and grandkids! i'd love for anyone who says same to get this shirt!
Bad! Why is this T-shirt named shitty fucking??What a bad name it is!Recommend?Never!😡
The shirts are amazing! I will be ordering again. And recommend them to others 🙂
My UD shirts are my favorites. They fit well, last long, and are unique. I always have people reading my back.
Amazing This shirt is SOOOOO comfortable and I love the definition
BEST SHIRT OF ALL TIME THIS IS THE BEST SHIRT OF ALL TIME. LITERAL FUCKING HELL OF A PLACE HAS BECOME A PART OF MY EVERDAY VOCABULARY AND I RECOMMEND IT FOR ANYONE WHO IS FORCED TO SIT IN A PLACE THEY HATE FOR AN HOUR EVERDAY. GO BUY THE MUG, SHIRT, OR SWEATSHIRT NOW!